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🕒 39th AIU Time Control System

An IoT-driven timing solution for the 39th AIU West Zone Youth Festival.

Hardware Device Presentation

The physical BLE Timer IoT device in action at CVM University.

🛠️ Tech Stack

C++ Arduino Espressif Bluetooth

🚀 Overview

The 39th AIU Time Control System is a professional-grade speech timer designed to manage competitive university events with precision. It bridges the gap between physical hardware and mobile convenience using ESP32 and Bluetooth Low Energy (BLE).

✨ Key Features

  • 📱 Smart Connectivity — Automatic filtering and connection to NOT_CNT_XXXX devices.
  • ⏲️ Advanced Timing — Managed phases for PREP, MIN, PERF, and GRACE periods.
  • 💡 Live Sync — Real-time countdown on both the app and the physical 8x32 LED matrix.
  • 🔒 Secure Operations — PIN-based authentication to prevent unauthorized control during sessions.
  • 📊 Performance Logs — Automatically logs session data including configurations and total overtime.

🎨 Visual Feedback & Logic

The device communicates status through a high-visibility RGB LED and a matrix display:

Phase LED Color Logic
Preparation 🟡 Yellow Counts down the user-defined setup time.
Session Start 🟢 Green Double green blink to signal the speaker to begin.
Min Threshold 🔵 Blue Quick blue flash when the minimum time is reached.
Overtime (Grace) ⚫ Off Display counts UP; no LED distractions for the speaker.
Conclusion 🔴 Red 5 red flashes to signal the official end of the round.

📐 Hardware Architecture

Circuit Diagram
  • Microcontroller: ESP32 (utilizing BLE 4.2 stack).
  • Display: MAX7219 Driven 8x32 LED Matrix (0-15 brightness levels).
  • Format: Supports MM:SS and automatically switches to H:MM for sessions ≥ 100 minutes.

⚙️ How to Run

  1. Hardware: Flash the firmware to your ESP32 and wire according to the diagram above.
  2. Permissions: Ensure Bluetooth and Location (on Android) are enabled for scanning.
  3. Authentication: Set a 4-digit PIN upon first launch to secure the interface.
  4. Testing: Use the "Test Device" menu in Settings to run the R/G/B and Segment diagnostic.

Developed for the Association of Indian Universities (AIU)
BLE Timer IoT App v1.0.0